Pattern maker&#39;s dowel



NOV. 1, 1932. v JOHNSON 1,885,204

PATTERN MAKER'S DOWEL Filed April 25. 1950 7 Q fiaamozzd Lx/rzzaaa f Z Y i I NNNNNN on Patented Nov. 1, 1932 TES. A rian? O FICE 7 RAYMOND L. JoHNsoN, or orrroneo, rL'rINor-s PATTERN MAKEBS nownr.

Application fi1ed Apri1'25,;1930.' seriaio.447,311.-,

I This ,inventionrelates to certain novel improvements in pattern maker 's dowels.

v Oneof theobjects of my invention is to ,15 permanently in the wooden cope and drag form. I c

Still another object of my invention is to .provide a pattern makers dowel having a pin which is interchangeable between the cope and drag parts of the dowel and which .may. be quickly removed from/either cope or. drag by means of a nail or similar ob- Jest, and likewiseinserted inthe'cope, or dra .bygmeans of a nailv or like object.

- Other objects will appear-hereinafter.

., The invention consistsin the novel coml bination and arrangement of parts to be heref inafterdescribedand claimed.

. I The invention will bebestnnderstood by -gmfref'erence to the accompanying drawing,

and in whichz" Fig.1 shows a patternmakers' wooden W showing. the preferred .form of construction .form in open position with the parts of my.

dowel inserted in position in cope and; drag;

Fig. 2. is a sectional View showing a patternmakerswooden form in closed position withmydowel'therein in closed position; and

Fig. 3 isa view taken substantially on the line '8 -3 on Fig. 2 showing a cross section of my dowel with the interchangeable pin removed, illustrating the manner of securing the dowel in fixed position in either the cope or drag "part of the wooden form.

Referring to the drawing wherein I have ,ill-ustrated'the preferred form of construc-' tion for my invention, 1 indicates the drag, portion of apatternmakers wooden formf 50. and Qindic'ates the cope portion thereof. In-

are integral therewith and to be described hereinafter.

serted in the cope portion 2 is one of the two exactly similar parts .3 of my-dowel with the interchangeable pin .L in the cope thus constituting the male half of the dowel as, used in working position. One dowel is shown at each end of the cope and drag j of thepattern better to illustrate the man-. ner of use. In the particular structure shown in the drawing'there is'finserted inv the drag portion 1 of the wooden pattern the female 69 structure ea of the dowel and the male stru'c-' ture 1sv inserted in the-cope of the wooden pattern. As will be explained hereinafter,

however, my dowel 'compris'estwo exactly similar parts so that the distinction between the 5 male and female parts thereof does not exist I except when. the interchangeable pin 4.. is f screwed into one. of the two similar parts to constitute that part the male member of the dowel. Hereinafter, therefore, the simis 70 larcope and drag structures will be generically referred to as 3, whereas, for purpose of'distinction and clearness, I will designate the male structureof the dowel as 8?; when the same is infworking position. Likewise, hereinafter I will refer to the female part-: of the dowel as 3a, it being understood that the interchangeable pinf t of the dowel is then in the cops portion. of the dowel to constitute the same the male half thereof 3?). In theconstruction of my invention the cope and drag structures 3 are machined from brass or other like material to form a substantially cylindrical housing 5 as best il-' lustrated in Fig. 8. Hereinafter it isunderstood that whenI refer to 5 I mean to desig nate thereby the'cylindrical housing as "the basic structureto which to refer for describing the other features of the pin housing that At' one end of the substantially cylindrical housing structure 5 and integral therewith is a substantially discshaped flange 6 eX- tending vcircumferentially around the cylinder 5. The outer surface of the disc-shaped .fiang'e structure 6 is flat so that when themale and female parts ofthe'dowel rest adjacent each other inworkingposition a perfect union will be formed. Extending,- longit'u'dinally .100

of the middle portion of the cylindrical housing 5, on the exterior surface thereof, and integral therewith, are substantially triangularly-shaped ridges o-r ribs 8 as best shown in Fig. 3.

The cylindrical housings 5 are bored internally throughout their entire length along the longitudinal axis of the housing to provide sockets and these sockets are constricted in diameter at the bottom portions thereof as shown in Fig. 2. The constricted lower portions of the sockets are screw threaded as shown at 7 in Fig. 2.

The intercl'iangeable pin t is cylindrical in shape throughout its main body portion. The pin 4 is constricted in diameter at one end thereof and this constricted portion is screw-threaded so that the pin may be readily inserted into the screw-threaded constricted portions of the sockets as best shown in Fig. 2. When in this position interiorly of the housing 5, the housing 5 and the pin constitute the male structure of the dowel. As explained hereinbefore the pin 4 may be exchanged between the housings 5 so as to constitute either one of the housings the male structure of the dowel, the other remaining the female structure thereof. The pin 4 is tapered conically at the end opposite the screw threaded portion as best illustrated in Fig. 2 and this tapered portion has a hole 10 extending therethrough transversely of the longitudinal axis of the pin.

In the use of my dowel the female structure 3a thereof is driven into the drag portion of the pattern makers form and the male structure is driven into the cope portion of the pattern makers form in suitably shaped holes drilled therefor in a manner well known in the art. In case the pattern maker should mistakenly drive the male structure of my dowel into the drag portion of the wooden form he may easily and quickly unscrew the pin 4 from the drag by means of a finishing nail or similar object, and likewise quickly and conveniently screw the pin into its proper position in the cope.

' In case the pattern maker discovers after he has inserted the male and female structures of my dowel into position in cope and drag respectively that he wishes to change the position of the male and female structures of the dowel in cope or drag, so as to place the male and female parts of the dowel in a stronger and more suitable portion of the cope and drag of the pattern, or should he wish to plane the surface wherein he has inserted the male and female parts of the dowel. he may quickly and conveniently remove the male part of the dowel by inserting a nail through the hole in the pin and exerting pressure thereon which will readily pry the male part of the dowel out of position in the cope of the pattern. Likewise, the female part of the dowel may be removed in a snmlar manner by inserting the pin therein. Should the pat tern maker have occasion to discard the wooden pattern he may quickly and conveniently remove the parts of the dowel therefrom and thus salvage the dowel for further use.

Nhen driven into suitable holes in the cope and drag of the pattern the housings are held rigidly therein by means of the substantially triangularly-shaped ridges 8 which engage the fibers of the wood and prevent movement of the male and female parts of the dowel therein. When the male and female parts of the dowel are driven into suitable holes in the cope and drag of the pattern the triangularly-shaped ridges 8 on the housings 5 engage the fibers of the wood tending to displace the fibers outwardly therefrom so that the spring like resistance of the fibers creates pressure against the wall of the housing; and

when the disc-shaped flange 6 engages these outwardly bent fibers it has a tendency to compress them against the wall of the housing between the upper extremities of the ridges 8 and the lower edge of the flange 6'so that the fibers are held rigidly against the wall of the housing. The housing is, inthis manner, held securely in the hole drilled therefor in the wood and accidental removal is prevented because the ridges 8 will, when the dowel is turned into inverted position, engage the fibers compressed in the space between the upper ends of the ridges and the lower edge of the flange and thus prevent accidental escape of the male and female parts of the dowel.

It is apparent from the foregoing description of my invention that I have described a dowel which is efficient in use, has a pin which is interchangeable between the cope and drag of a pattern, which can be quickly and easily driven into the wooden cope and drag pattern used in pattern making, and which eliminates the necessity of unscrewing or removing the maleand female structures of the dowel from the holes drilled therefor in the wooden cope and drag forms of the pattern and reinserting them in proper position in case the pattern maker makes a mistake in positioning the male and female structures of the dowel in unsuitable position in either cope or drag, or

inserts the male structure of the dowel in the drag and the female structure in the cope whereas the proper position is the converse thereof.

While I have illustrated and described the '1 fore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention what 1 claim as new and desire to protect by Letters Patent is:

1. A dowel pin structure comprising a pair of axially opposed members each provided 1 with a socket threaded in part, a pin including a head and a threaded shank interchangeably receivable in the threaded part of one socket with said head extendin into the unthreaded part of the. other soc et, said head having a tool-receiving slot extending trans= versely therethrough for inserting said pin into and removing it from'its socket and rlbs on the exterior of said members adapted to engage the walls of a recess to secure said members therein. A

2. A dowelpin structure comprising a pair of. axially opposed -members each having formed therein a socket, each of said sockets having a threaded portion and an unthread ed portion, and a pin having a threaded shank interchangeably threadable into said threaded portions of said sockets, said pin including a head interchangeably receivable in said unthreaded portions of said sockets and said head having a tool-receiving slot extending transversely therethrough.

In testimony whereof I affix my signature;

RAYMOND L. JOHNSON. 

